net/ipv6/ip6_udp_tunnel.c

   1 #include <linux/module.h>
   2 #include <linux/errno.h>
   3 #include <linux/socket.h>
   4 #include <linux/udp.h>
   5 #include <linux/types.h>
   6 #include <linux/kernel.h>
   7 #include <linux/in6.h>
   8 #include <net/udp.h>
   9 #include <net/udp_tunnel.h>
  10 #include <net/net_namespace.h>
  11 #include <net/netns/generic.h>
  12 #include <net/ip6_tunnel.h>
  13 #include <net/ip6_checksum.h>
  14
  15 int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
  16                      struct socket **sockp)
  17 {
  18         struct sockaddr_in6 udp6_addr;
  19         int err;
  20         struct socket *sock = NULL;
  21
  22         err = sock_create_kern(AF_INET6, SOCK_DGRAM, 0, &sock);
  23         if (err < 0)
  24                 goto error;
  25
  26         sk_change_net(sock->sk, net);
  27
  28         udp6_addr.sin6_family = AF_INET6;
  29         memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
  30                sizeof(udp6_addr.sin6_addr));
  31         udp6_addr.sin6_port = cfg->local_udp_port;
  32         err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
  33                           sizeof(udp6_addr));
  34         if (err < 0)
  35                 goto error;
  36
  37         if (cfg->peer_udp_port) {
  38                 udp6_addr.sin6_family = AF_INET6;
  39                 memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
  40                        sizeof(udp6_addr.sin6_addr));
  41                 udp6_addr.sin6_port = cfg->peer_udp_port;
  42                 err = kernel_connect(sock,
  43                                      (struct sockaddr *)&udp6_addr,
  44                                      sizeof(udp6_addr), 0);
  45         }
  46         if (err < 0)
  47                 goto error;
  48
  49         udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
  50         udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
  51
  52         *sockp = sock;
  53         return 0;
  54
  55 error:
  56         if (sock) {
  57                 kernel_sock_shutdown(sock, SHUT_RDWR);
  58                 sk_release_kernel(sock->sk);
  59         }
  60         *sockp = NULL;
  61         return err;
  62 }
  63 EXPORT_SYMBOL_GPL(udp_sock_create6);
  64
  65 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
  66                          struct sk_buff *skb,
  67                          struct net_device *dev, struct in6_addr *saddr,
  68                          struct in6_addr *daddr,
  69                          __u8 prio, __u8 ttl, __be16 src_port,
  70                          __be16 dst_port, bool nocheck)
  71 {
  72         struct udphdr *uh;
  73         struct ipv6hdr *ip6h;
  74
  75         __skb_push(skb, sizeof(*uh));
  76         skb_reset_transport_header(skb);
  77         uh = udp_hdr(skb);
  78
  79         uh->dest = dst_port;
  80         uh->source = src_port;
  81
  82         uh->len = htons(skb->len);
  83
  84         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
  85         IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
  86                             | IPSKB_REROUTED);
  87         skb_dst_set(skb, dst);
  88
  89         udp6_set_csum(nocheck, skb, saddr, daddr, skb->len);
  90
  91         __skb_push(skb, sizeof(*ip6h));
  92         skb_reset_network_header(skb);
  93         ip6h              = ipv6_hdr(skb);
  94         ip6_flow_hdr(ip6h, prio, htonl(0));
  95         ip6h->payload_len = htons(skb->len);
  96         ip6h->nexthdr     = IPPROTO_UDP;
  97         ip6h->hop_limit   = ttl;
  98         ip6h->daddr       = *daddr;
  99         ip6h->saddr       = *saddr;
 100
 101         ip6tunnel_xmit(sk, skb, dev);
 102         return 0;
 103 }
 104 EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
 105
 106 MODULE_LICENSE("GPL");